Document 6B0azzwGkej899M86eGqYXyVR

HEATINC VENTILATING AIR CONDITIONING GUIDE 1942 Temp. F 0 2 4 5 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 3839 40 41 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 74 76 78 80 82 84 $6 88 90 92 94 96 98 100 102 104 106 108 110 112 114 116 118 120 122 124 126 128 PBS8. Lb pee Sq In. 30.42 31.92 33.47 34.27 35.09 36.77 38.51 40.31 42.18 44.12 46.13 48.21 50.36 52.59 54.90 57.28 59.74 62.29 64.91 67.63 70.43 71.87 73.32 74.80 76.31 7948 82.55 8542 89.19 9166 96.23 99.91 103.7 107.6 111.6 115.7 120.0 124.3 128.8 133.4 138.1 143.0 147.9 153.0 1584 163.7 169.2 1744 180.6 186.6 1917 198.9 2054 211.9 218.6 225.4 232.5 239.7 247.0 2544 2612 270.1 278.2 286.4 294.8 303.4 3124 321.2 liquid 0.02419 0.02424 0.02430 0.02432 0.02435 0.02440 0.02446 0.02451 0.02457 0.02462 0.02468 0.02474 0.02479 0.02485 0.02491 0.02497 0.02503 0.02508 0.02514 0.02521 0.02527 0.02530 0.02533 0.02536 0.02539 0.02545 0.02551 0.02558 0.02564 0.02571 0.02577 0.02584 0.02590 0.02597 0.02604 0.02611 0.02618 0.02625 0.02632 0.02639 0.02646 0.02653 0.02661 0.02668 0.02675 0.02684 0.02691 0.02699 0.02707 0.02715 0.02723 0.02731 0.02739 0.02747 0.02756 0.02764 0.02773 0.02782 0.02790 0.02799 0.02808 0.02817 0.02827 0.02836 0.02846 0.02855 0.02865 0.02875 Table 1. Properties of Ammonia Vapor 9.116 8.714 8.333 8.150 7.971 7.629 7.304 6.996 6.703 6.425 6.161 5.910 5.671 5.443 5.227 5.021 4.825 4.637 4.459 4.289 4.126 4.048 3.971 3.897 3.823 3.682 3.547 3.418 3.294 3.176 3.063 2.954 2.851 2.751 2.656 2.565 2.477 2.393 2-312 2.235 2.161 2.089 2.021 1.955 1.892 1.831 1.772 1.716 1.661 1.609 1.559 1.510 1.464 1.419 1.375 1.334 1.293 1.254 1.217 1.180 1.145 1.112 1.079 1.047 1.017 0.987 0.958 0.931 Heat Content and Bntropt Taken From --40 F Beat Content Entropy 100 F Superheat 200 F Superheat liquid 42.9 45.1 47.2 48.3 49.4 51.6 53.8 56.0 58.2 60.3 62.5 64.7 66.9 69.1 71.3 73.5 75.7 77.9 80.1 82.3 84.6 85.7 86.8 87.9 89.0 91.2 93.5 9S.7 97.9 100.2 102.4 104.7 106.9 109.2 111.5 113.7 116.0 118.3 120.5 122.8 125.1 127.4 129.7 132.0 134.3 136.6 138.9 141.2 143.5 145.8 . 148.2 150.5 152.9 155.2 157.6 159.9 162.3 164.6 167.0 169.4 171.8 174.2 176.6 179.0 181.4 183.9 186.3 188.8 Vapor 611.8 612.4 613.0 613.3 613.6 614.3 614.9 615.5 616.1 616.6 617.2 617.8 618.3 618.9 619.4 619.9 620.5 621.0 621.5 622.0 622.5 622.7 623.0 623.2 623.4 623.9 624.4 624.8 625.2 625.7 626.1 626.5 626.9 627.3 627.7 628.0 628.4 628.8 629.1 629.4 629.8 630.1 630.4 630.7 631.0 631.3 631.5 631.8 632.0 632.2 632.5 632.6 632.9 633.0 633.2 633.4 633.5 633.6 633.7 633.8 633.9 634.0 634.0 634.0 634.0 634.0 633.9 633.9 liquid 0.0975 0.1022 0.1069 0.1092 0.1115 0.1162 0.1208 0.1254 0.1300 0.1346 0.1392 0.1437 0.1483 0.1528 0.1573 0.1618 0.1663 0.1708 0.1753 0.1797 0.1841 0.1863 0.7685 0.1908 0.1930 0.1974 0.2018 0.2062 0.2105 0.2149 0.2192 0.2236 0.2279 0.2322 0.2365 0.2408 0.2451 0.2494 0.2537 0.2579 0.2622 0.2664 0.2706 0.2749 0.2791 0.2833 0.2875 0.2917 0.2958 0.3000 0.3041 0.3083 0.3125 0.3166 0.3207 0.3248 0.3289 0.3330 0.3372 0.3413 0.3453 0.3495 0.3535 0.3576 0.3618. 0.3659 0.3700 0.3741 Vapor Ht.Ct. Entropy Ht Ct. Entropy 1.3352 1.3312 1.3273 1.3253 1.3234 1.3195 1.3157 1.3118 1.3081 1.3043 1.3006 1.2969 1.2933 1.2897 1.2861 1.2825 1.2790 1.2755 1.2721 1.2686 1.2652 1.2635 1.2618 1.2602 1.2585 1.2552 1.2519 1.2486 1.2453 1.2421 1.2389 1.2357 1.2325 1.2294 1.2262 1.2231 1.2201 1.2170 1.2140 1.2110 1.2080 1.2050 1.2020 1.1991 1.1962 1.1933 1.1904 1.1875 1.1846 1.1818 1.1789 1.1761 1.1733 1.1705 1.1677 1.1649 1.1621 1.1593 1.1566 1.1538 1.1510 1.1483 1.1455 1.1427 1.1400 1.1372 1.1344 1.1316 666.8 667.6 668.4 668.8 669.3 670.1 670.9 671.7 672.5 673.4 674.2 675.0 675.8 676.6 677.3 678.1 678.9 679.7 680.4 681.2 681.9 682.3 682.7 . 683.1 683.4 684.2 684.9 685.6 686.4 687.1 687.8 688.5 689.2 689.9 690.6 691.3 691.9 692.6 693.3 694.0 694.6 695.3 695.9 696.6 697.2 697.8 698.5 699.1 699.7 700.3 700.9 701.5 702.1 702.7 703.3 703.8 704.3 705.0 705.5 706.1 706.6 707.2 707.7 708.2 708.6 709.1 709.6 710.0 1.4439 1.4400 t.4360 1.4340 1.4321 1.4281 1.4242 1.4205 1.4168 1.4130 1.4093 1.4056 1.4021 1.3985 1.3950 1.3914 1.3879 1.3846 1.3812 1.3779 1.3745 1.3729 1.3712 1.3696 1.3680 1.3648 1.3616 1.3584 1.3552 1.3521 1.3491 1.3460 1.3430 1J309 1.3370 1.3341 1.3312 1.3283 1.3254 1.3226 1.3199 1.3171 1.3144 1.3116 1.3089 1.3063 1.3040 1.3010 1.2983 1.2957 1.2932 1.2906 1.2881 1.2855 1.2830 1.2805 1.2780 1.2755 1.2731 1.2708 1.2684 1.2661 1.2636 1.2612 1.2587 1.2563 1.2538 1.2513 720.3 721.2 722.2 722.6 723.1 724.1 725.0 725.9 726.8 727.8 728.7 729.6 730.S 731.4 732.4 733.3 734.2 735.1 736.0 736.8 737.7 738.2 738.6 739.0 739.5 740.4 741.3 742.2 743.1 744.0 744.8 745.7 746.5 747.4 748.2 749.1 749.9 750.8 751.6 752.4 753.3 754.1 '755.0 755.8 756.6 757.4 758.3 759.1 759.9 760.7 761.5 762.2 763.0 76-1.8 764.6 765.3 766.1 766.9 767.6 768.3 769.1 769.8 770.5 771.3 772.0 772.8 773.5 774.2 1.5317 1.5277 1.5236 1.5216 1.5196 1.5155 1.5115 1.5077 1.5039 1.5001 1.4963 1.4925 1.4889 1.4853 1.4816 1.4780 1.4744 1.4710 1.4676 1.4643 1.4609 1.4592 1.4575 1.4559 1.4542 1.4510 1.4477 1.4445 1.4412 1.4382 1.4351 1.4321 1.4290 1.4260 1.4231 1.4202 1.4172 1.4143 1.4114 1.4086 1.4059 1.4031 1.4004 1.3976 1.3949 1.3923 1.3896 1.3870 1.3843 1.3818 1.3793 1.3768 1.3743 1.3718 1.3693 1.3668 1-3643 1.3619 13596 1.3573 1.3550 1.3527 1.3503 1.3479 1.3455 1.3431 1.3407 1.3383 480 CHAPTER 25. REFRIGERATION removed by an available cooling medium. In order to conserve refri gerant, virtually all refrigeration systems are completely closed and the same refrigerant is recirculated. The fundamental heat equations (disregarding losses) which should be kept in mind are: (1) the heat absorbed in the evaporator plus'the heat added to the refrigerant during compression equals the heat rejected by the condenser; (2) the heat added to the refrigerant during compression is equal to 4:he input to the compressor shaft less the heat dissipated from the compressor to the surroundings. In the case where the compressor is driven by an electric motor, the heat due to compression is equal to the motor input less the electrical motor losses, less the power transmission losses and less the heat dis sipated from the compressor to the surroundings. Heat of Compression Added to Gas Refrigerants There are many substances which might be used as refrigerants in mechanical refrigeration systems, but in practice the choice is limited by a wide variety of considerations including availability, cost, safety, chemical stability and adaptability to the type of refrigerating system to be used. In this chapter detailed consideration is limited to six substances, viz: ammonia, dichlorodifluoromethane (F 12), methyl chloride, carbon dioxide, monofluorotrichloromethane (Fu), and water, properties for each of which are given in Tables 1, 2,3,4, 5 and 6. Each table gives the principal physi cal properties of the saturated substance, and all are arranged in uniform fashion. In all except the water table, columns are included which give the heat content and entropy of the superheated vapor at two selected points. The first four refrigerants named are used in reciprocating and rotary compressors. The last two are used in centrifugal compressors. Water is also used in steam jet equipment. 481